There are many possibilities, and here are a couple:
A dodecagonal prism (dodecagon = 12 sided plane figure);
A heptagonal pyramid (heptagon = 7 sided plane figure).
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Dodecahedron.
2d
3d + 14 = 11 is the equation.
2-Dimensional
take, for an example, a duck. This is a 3d shape because it has three dimensions. Compare this to a square, which is 2d. the difference is that the duck has a beak, and the square does not.